Nation

Follow PBS NewsHour’s complete coverage of U.S. news, reports and analysis.

May 04

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U.S. Broadcast Industry

On Christmas Eve 1906, Canadian inventor Reginald Fessenden conducted the first radio broadcast in history, sending a recording of Handel's Largo, Christian hymns and a "Merry Christmas" to United Fruit Co. boats in the Atlantic Ocean.

A suicide bomber posing as a job applicant at a police recruiting center in the city of Irbil blew himself up Wednesday, killing at least 50 people and wounding some 100 others. An Iraqi militant group claimed responsibility for the…

May 02

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Types of Nuclear Bombs

In an atomic bomb, the energy or force of the weapon is derived only from nuclear fission - the splitting of the nucleus of heavy elements such as plutonium or highly enriched uranium into lighter nuclei.